Pump construction



Nov. 23 1926. 1,607,657

T. c. WHITEHEAD PUMP CONSTRUCTION Filed May 5. 1924 my mew W I mrwm,

l mented Nov. 23 llfdde THOMAS C. 'ViTHITEHEAl), F BETBQIT Applicationfiled Itllay 5,

1% tion is to provide a simple and efiicient device that is adapted tobe operated automatically -tor controlling the compression within thecylinder of a pump.

Another object is to provide a strong and ti durable device that can bemanufactured at a very low cost.

"With the above and other objects in view the invention consists incertain novel teatnres of construction, combination and ar 20 rangementsof parts as will be more fully described and particularly pointed out inthe appended claims.

in the accompanying diaw1n,

Figure 1 is a central longitudinal seitions al view throu h a June) andrelief device embodying my invention;

Figure 2 is a top plan view or? the device.

Referring" now to the drawing in which lilre characters of referencedesignate corresponding parts through the several views, the numeral 1designates a cylinder, preterably of a refrigerating pump having inletand outlet passages 2 and 3 respectively 35 thegaseous refrigeratingmedium which is ada ted to be compressed within the cylinder means of apiston 4. This piston. may be reciprocated within the cylinder by anysuitable means such as a pitman 5 and is preferably provided with alongitudinally extending passage 6 which communicates with atransversely extending 7. Thus, when the piston is operated a partialvacuum will be formed in the cylinder upon the suction stroke until theinlet passage 2 is uncovered, whereupon the refrigerating gas will beadmitted to the cylinder. @n the reverse stroke of the piston the gaswill be compressed until the transverse passage '2 in the pistonregisters with the outlet passage in the cylinder at the completion ofthe movement whereupon the compressed gas will be discharged through theoutlet passage 3.

ln order that the compression in the cylinder may be relieved tofacilitate the start- 19%. Serial lilo. M13655.

ing if the pump, ll preferably provide a small vent 8 1n the head 9 ofthe cylinder.

For controlling the opening and closing of this vent, there is a needlevalve 10 having a tapered lower end 11 adapted to seat upon the upperedges of the vent 8. This valve extends upwardly through a flangedtubular guide 12 mounted on the cylinder head 9 and is preferablyoperated automatically by means of a thermostat 13. [is shown, thethermostat is in the form of an expansible chamber or bellows it that ispreferably disposed within a tubular casing 15 which has a flange 16 atthe lower end thereof surroundingthe flange 17 of the guide 12 on thecylinder head The closed lower end 18 ot the chamber is secured to thevalve 10, While the upper end it} of the chamber preferably abuts thetop 20 ot the casing l5 and is pro vided with a tubular projection 21that extends upwardly through an opening 22 in the casing top 20Suitable nuts 23 are preferably threaded upon the projection 21 to holdthe npner end 19 of the chamber firmly against t is casing" top Qt)while a suitable plug is preferably used to close the 25 the projection93L desired, a predeteri dned quantity of ethyl bromide may beintroduced the chamber l l through the passage 25 in the projection 21to facilitate the en ansion and contraction or the chamber it, w iile asuitable coil spring 26 is preferably disposed between the lower end 18ot the chamber and the flange 17 ot the guide and cooperates with thechamber when contracted to hold the valve 10 unseat ed. In order thatthe gas escaping through the vent may pass into the casing 15 andthenout through the port 27 in one Wall thereof, the guide 12 ispreferably provided at its lower end with an outwardly flared portion 28that connects into the flange l7 and is provided with a plurality ofsmall openings 29 in communication with the vent 8a 1 ll ln use, whenthe pump is not operating and is cold the chamben l l will becontracteol, hence the valve 10 will be unseated and the compression inthe cylinder will be relieved so that it will be comparatively ill) easyto start the pump: However, after the pump is started the chamber 1%will become heated through operation of the piston with in the cylinderand, as a result, Will seat the valve upon the upper edges of the vent 8in. the cylinder head and will retain the engine and the like.

valve in seated position during the normal operation of the pump. Thus,it will be readily apparent that the compression in the cylinder will becontrolled automatically by a very simple and ractical device which maybe readily applie to the cylinder heads of any suitable pump, internalcombustion Moreover, the relief device is composed of relatively fewparts which may be easily and quickly assembled, hence, the cost ofmanufacture is reduced to a minimum.

While it is believed that from the foregoing description, the nature andadvantages ot' the invention will be readily apparent, ll desire to haveit understood that I do not limit myself toi what is herein shown anddescribed, and that such changes may be resorted to when desired as fallwithin the scope of What is claimed.

What I claim as my invention is:

1. The combination with a cylinder having a vent for relievingcompression, of means for controlling the opening and closing of saidvent, said means including a valve engageable with the vent, a guide forthe valve secured to the cylinder, and a thermostat for operating thevalve.

2. The combination with a cylinder having a vent for relievingcompression, of

moms? means for controlling the opening and closing of said vent, saidmeans including a valve engagcable with the vent, a easing into whichsaid vent opens, and a thermostat within the casing for operating thevalve.

3. The combination with a cylinder having a vent for relievingcompression, oi means for controlling the opening and closing of saidvent, said means including a valve engageable with the vent, a casingenclosing the valve, a thermostat within the casing connected to thevalve for operating the same, said thermostat having a tubularprojection extending through the casing,

and means for securing the extension to the casing.

4. The combination with a cylinder hav ing a vent for relievingcompression, of means for controlling the opening and closing of saidvent, said means including a needle valve engageable with the vent, atubular guide for the valve secured to the cylinder and having anopening communicating with the vent, a casing over the valve and guideand having an opening therein, and a thermostat within the casing foroperating the valve, said thermostat being secured to said casing and tosaid valve.

In testimony whereof I afiix my si nature.

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